Yukawa meson: Meaning and Definition of

Yuka'wa me"son

Pronunciation: [key]
— Physics. Physics.
  1. a hypothetical elementary particle with finite rest mass, whose exchange between nucleons would account for the strong short-range forces between nucleons: subsequently identified as the pion.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.